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Single-position ligand modifications tune CB2R activity by targeting the toggle switch.

Rudolf L Z Ganzoni1, Miroslav Kosar1, Yongqi Han2

  • 1Laboratorium für Organische Chemie, Eidgenössische Technische Hochschule Zürich Vladimir-Prelog-Weg 3 8093 Zürich Switzerland erickm.carreira@org.chem.ethz.ch.

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Summary
This summary is machine-generated.

Researchers developed novel ligands targeting the Cannabinoid receptor type 2 (CB2R) by modifying a single amino acid. This strategy precisely controls receptor activity, offering new therapeutic approaches for inflammatory diseases and pain.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Medicinal Chemistry

Background:

  • Cannabinoid receptor type 2 (CB2R), a class A G protein-coupled receptor (GPCR), is a key therapeutic target for inflammatory conditions, pain, and neurodegenerative diseases.
  • Developing selective ligands with tunable activity is crucial for effective therapeutic intervention.

Purpose of the Study:

  • To design and synthesize novel CB2R ligands based on the HU-308 scaffold with diverse sidechains.
  • To investigate how structural modifications influence GPCR activation and functional outcomes.
  • To explore the role of the CB2R toggle switch residue (Trp2586.48) in ligand-mediated modulation.

Main Methods:

  • Synthesis of a series of ligands with a common scaffold and varied sidechains.
  • Functional assays to assess ligand activity, including agonism, antagonism, and inverse agonism.
  • Molecular dynamics simulations to elucidate the structural basis of ligand-receptor interactions.

Main Results:

  • Structural modifications at a single position enabled precise control over CB2R activity, achieving a spectrum of functional outcomes from full agonism to partial inverse agonism.
  • Several low-efficacy ligands exhibited protean behavior, demonstrating context-dependent CB2R modulation.
  • A CF3-substituted (S)-1 ligand showed distinct affinity, potency, and biased signaling, rationalized by molecular dynamics simulations indicating stabilization of an active conformation via interaction with the toggle switch.

Conclusions:

  • Strategic modification of GPCR ligands, specifically targeting the toggle switch residue, can precisely modulate receptor activity across the efficacy spectrum.
  • This approach offers a versatile strategy for developing tailored CB2R modulators for therapeutic applications.
  • Understanding ligand-receptor dynamics at the toggle switch is critical for designing biased agonists and optimizing therapeutic profiles.